Walmart offers the Monster SoundStage S1 Mini Wireless Speaker for $50. Choose in-store pickup to drop it to $49. That's $37 under our February mention and the lowest price we've seen. (It's the best deal now by $11.) It features both WiFi and Bluetooth connectivity.
Kmart offers the iLive 2.1-Channel Wireless Three-Speaker System for $37.65. Plus, SYWR members receive around $20.38 in SYWR Points. (Not a member? It's free to join.) Opt for in-store pickup to avoid the $6.25 shipping charge. Assuming you'll use the credit, that's the lowest price we could find by $15. This Bluetooth system includes a subwoofer and two speakers and features LED lighting.